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Please explain the colors on a See-All sight glass. This is a new sight glass. The sticker on the side of it has the color green with Dry typed over it and the color yellow with wet typed over it. Inside the sight glass in the middle there is a 1/4" diameter material.

Does the thing in the middle turn to a green color if there is not enough refrigerant and turn yellow if refrigerant goes over it? If it turns yellow is this what is meant by charging to a clear sight glass? Do you use the colors to check refrigerant charge?

"Wet" and "dry" have nothing to do with refrigerent levels, they indicate moisture. Moisture as in water, H2O. Moisture is the supreme enemy of a refrigeration system and the siteglass with moisture reactor gives us a visual indicator of the status of such. On the Sporlan, green means dry which is good. Yellow means wet, you need to get the moisture out ofthe system. You can do this with drier changes, oil changes, sometimes you must drop the charge and pull a deep vacuum to get it all.

On edit.. today had a yellow sight glass that system was labeled " system is wet, do not run"(from previous contractor).
We know the system is wet because , when we replaced Evap. cond.and this circuit had water in condensing loop (weee).
We are remodeling store and we have to get this 2nd stage of A.C. running for De-Humid. Many RIIC/RIFF cases sweating behind and running to sales floor.
The system has been in a vac. through the past weekend. So today we start it , it ran for 5 minutes then comp pumped down.
Noo , not pumped down on TXV, but suction screen of the Carlyle 4H40. Removed screen and found foamy brown mud.
New oil and RCW's made no difference. Cleaned screen and it did it 2 more times. Suction line bfore service valve 75#, after service valve(comp body) 15. :0

Glass is still yellow

Now we are going to put in a DFN to help the cleaning process.
YELLOW IS BAD

Originally posted by frozensolid Ned, was that foamy brown mud, part copper oxide?

Hell ,I don't know what it is...I'm a simple market monkey .
It seems to be a foam that you get with oil and water mixed with turbulence . Virginia spray and contact cleaner had a hard time with it.
Hopefully ,the suction filter will be enough surface area to get the comp. some runtime and some heat in the system to clean it out.
Yucky

I am having a similar issue here. I saw orange color liquid flowing thru the sight glass. I guess it means the same as yellow? I have two questions. One is that it actually didn't last long. So does it mean the situation isn't that severe yet? Second, how do we take the moistureu out of the system? Only a pro can do it? I washed the whole outdoor unit (coil, fins, and kinda rinsed compressor pretty good), could it cause the moisture issue?

Sorry, wasn't clear. For question 1, i meant the orange color thing didn't go on for long, just about 20, 30 seconds. Then i coulnd't see anything anymore in the sight class. It actually looked very clear and i thought nothing went thru the sight glass anymore freon was low in the system.